<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>Parametric Surfaces Fun - ECHARTS-GL</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes"> <!-- Fullscreen Landscape on iOS -->
    <link rel="stylesheet" href="./common.css">
</head>
<body>
<div id="main"></div>
<script src="../node_modules/echarts/dist/echarts.js"></script>
<script src="../dist/echarts-gl.js"></script>
<script src="lib/jquery.min.js"></script>
<script src="js/commonUI.js"></script>
<script>
    // http://xahlee.info/surface/breather_p/breather_p.html
    var chart = echarts.init(document.getElementById('main'));

    var sin = Math.sin;
    var cos = Math.cos;
    var pow = Math.pow;
    var sqrt = Math.sqrt;
    var cosh = Math.cosh;
    var sinh = Math.sinh;
    var PI = Math.PI;

    var aa = 0.4;
    var r = 1 - aa * aa;
    var w = sqrt(r);

    chart.setOption({
        toolbox: {
            left: 20,
            iconStyle: {
                normal: {
                    borderColor: '#000'
                }
            },
            feature: {
                myExportObj: {
                    title: 'Export OBJ',
                    icon: 'M4.7,22.9L29.3,45.5L54.7,23.4M4.6,43.6L4.6,58L53.8,58L53.8,43.6M29.2,45.1L29.2,0',
                    onclick: function () {
                        var res = echarts.exportGL2PLY(myChart, {
                            mainType: 'grid3D',
                            index: 0
                        });
                        download(res, 'surface.ply', 'text/plain');
                    }
                }
            }
        },
        tooltip: {},
        visualMap: {
            show: false,
            dimension: 0,
            min: -9,
            max: 9,
            inRange: {
                //color: ['#313695', '#4575b4', '#74add1', '#abd9e9', '#e0f3f8', '#ffffbf', '#fee090', '#fdae61', '#f46d43', '#d73027', '#a50026']
                color: ['#00007F', '#0000FF', '#00FFFF', '#00FF00', '#FFFF00', '#FF0000', '#7F0000']
            }
        },
        xAxis3D: {},
        yAxis3D: {},
        zAxis3D: {},
        grid3D: {
            show: true,
            postEffect: {
                enable: true,
                SSAO: {
                    enable: true,
                    radius: 4
                }
            },
            viewControl: {
                distance: 130,
                beta: 50
            },
            light: {
                main: {
                    intensity: 2,
                    shadow: true
                },
                ambient: {
                    intensity: 1
                },
                ambientCubemap: {
                    //texture: 'data-gl/asset/canyon.hdr',
                    exposure: 2,
                    diffuseIntensity: 0.2,
                    specularIntensity: 1
                }
            }
        },
        series: [{
            type: 'surface',
            parametric: true,
            wireframe: {
                show: false
            },
            shading: 'color',
            realisticMaterial: {
                roughness: 0.3,
                metalness: 0
            },
            parametricEquation: {
                u: {
                    min: -13.2,
                    max: 13.2,
                    step: 0.2
                },
                v: {
                    min: -37.4,
                    max: 37.4,
                    step: 0.2
                },
                x: function (u, v) {
                    var denom = aa * (pow(w * cosh(aa * u), 2) + aa * pow(sin(w * v), 2))
                    return -u + (2 * r * cosh(aa * u) * sinh(aa * u) / denom);
                },
                y: function (u, v) {
                    var denom = aa * (pow(w * cosh(aa * u), 2) + aa * pow(sin(w * v), 2))
                    return 2 * w * cosh(aa * u) * (-(w * cos(v) * cos(w * v)) - (sin(v) * sin(w * v))) / denom;
                },
                z: function (u, v) {
                    var denom = aa * (pow(w * cosh(aa * u), 2) + aa * pow(sin(w * v), 2))
                    return 2 * w * cosh(aa * u) * (-(w * sin(v) * cos(w * v)) + (cos(v) * sin(w * v))) / denom
                }
            }
        }]
    });

    window.addEventListener('resize', function () {
        chart.resize();
    });

</script>
</body>
</html>
